Question

How do you find the slope of a straight line obtained on a graph?

Answer 1

To find a slope of a graph we take the following steps

a. Take two points P and Q on the line, at a distance more than half the length of the line. The points should be so chosen that the value of x and y should be easily read on the axes.

b. Draw horizontal and vertical lines from these points on the axes, and read the values of x, say x_1, and the value of y, say y₁ for the point P. Similarly, the values of x, say x₂, and the value of y, say y₂, for the point Q.

c. Calculate Δy = y₂ - y₁ and Δx = x₁ - x₂. Calculate the slope of the graph m = Δy/Δx